Current Injection Free-Exciton Recombination Emission from Synthesized Diamond

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Abstract
Emission in the UV region is obtained at room temperature from a current injection light-emitting device composed of high-quality synthesized diamond crystal. The operating wavelength is observed to be as short as 235 nm. The main mechanism for the UV emission is found to be TO-phonon-assisted free-exciton recombination, both in the surface conduction device as well as in the p-type one. Since the exciton plays the role of an intermediate state in the photon emission process even at room temperature, the emission efficiency is expected to be higher than that of other indirect semiconductors.